Cube is not a creative colour!~
I get it, having ideas for new games is hard. You just looked up the tutorial for "3D unity game" and clicked on the first youtube video. And then copied everything from that. Twice. It really takes effort to come up with something new, huh?
Let's actually dissect what you added here.. your leveldesign has to be the most solid part of this, because it's somewhat decent, however everything else is not.
Your art assets are horribly misplaced. Choosing a good color pallete is not hard and yet you somehow fucked it up, no need to add that tail either, it blocks the screen.
Your coding sucks. You followed a basic tutorial and didn't bother to playtest the game for several minutes to realise that the cube has so much speed and friction the game is unbearable to play at longer levels due to the inhuman reaction time required. It takes tweaking of public values but you couldn't be fucked to do it to make the game reasonable to play.
Your sounds and music do not exist. Gamedev 101 is adding sounds to your game but that I guess takes effort and we can't have that in our copycat [Tutorial game]
I have a feeling if you put out such stuff you won't read this seriously, but I urge you to come up with your own ideas. Other than that, take your 0.5 of a star for having a functional game you built and done, I am sure it was a good learning experience. I would rate it higher but dragging my cursor to the right takes too much effort